LAS VEGAS — Jim Henderson entered last offseason unsure if he even would receive an invite to somebody’s major-league camp, but on Friday could call himself a big leaguer again.

The former Brewers closer was selected to the Mets’ 25-man roster after an impressive spring training in which he showed no residual effects from his two shoulder surgeries.

Henderson joined Logan Verrett among pitchers who were on the bubble to make the 25-man roster. Sean Gilmartin, who began the spring with an inside track on a bullpen job, was optioned to Triple-A Las Vegas, where he is expected to give the Mets rotation insurance.

The 33-year-old Henderson recorded 28 saves for the Brewers in 2013, but a second shoulder surgery sidelined him for most of the following year. Henderson returned to the mound last season, but never escaped Triple-A for the Rockies.

Henderson compared the elation of making the Mets’ roster to the first time he was called up to the majors.

“It feels honestly real similar because of the last two years and the battle to get back,” Henderson said. “Anytime you have an injury or go through that process, I always told myself I owe it to myself to keep battling and keep playing.

“Coming into the offseason I didn’t know whether I was going to be in independent ball or having any kind of contract, but I knew I was going to play. I knew I was going to give it all I have for this next year and I am happy I have gotten to this point.”

Steven Matz pitched five hitless innings and struck out six in his best outing of the spring. The lefty will now wait at least a week until his next start, but will be available in the bullpen Tuesday in Kansas City.

“I feel like I’ve thrown enough innings in spring that I’m where I need to be,” Matz said.

The lefty said he was pleased with the bite on his slider Friday.

“I’ve been using it, working on it on and off for the past year or so,” Matz said. “I feel like I’m really getting it to where I need to be.”

Kevin Plawecki will begin the season as the backup catcher, after the organization decided there will be enough at-bats available to him in the major leagues. Johnny Monell was optioned to Las Vegas.

“I can finally take a deep breath,” Plawecki said. “My heart was racing a little bit on the bus ride here, but I am just happy to play baseball now.”

Matt Reynolds was optioned to Las Vegas, leaving Wilmer Flores as the only backup shortstop on the roster. Erik Goeddel also was optioned to Las Vegas.